JPH10137648A - Coating solution supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating soln. supply apparatus capable of suppressing the leakage of a coating soln. SOLUTION: Two elastic doctor blades 14 attached to opposed base parts 13 in a cantilevered state are arranged so that the inteval between the blades on the free end side thereof becomes narrower than the interval therebetween on the fixed end side thereof and the respective elastic seal plates 15 attached to the base parts 13 in a cantilevered state are arranged to the parts near to both ends between two doctor blades 14 so as to come into contact with two doctor blades 14 and a liquid sump space S surrounded by the doctor blades 14 seal plates 15 and the base parts 13 and the seal plates 15 are obliquely arranged so that the contact lines of the doctor blades 14 and the seal plates 15 obliquely traverse the dotor blades 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating liquid supply apparatus for supplying a coating liquid into a large number of cells recessed on the outer peripheral surface of a gravure roll.

[0002]

2. Description of the Related Art A conventional coating liquid supply device 1 is disposed outside a gravure roll 2 as shown in a partially sectional side view of FIG. It is like that. The coating liquid supply device 1 includes a base 3 extending in the longitudinal direction of the gravure roll 2, two elastic doctor blades 4, 4 attached to the base 3 in a cantilever state so as to face each other, and two Doctor blade 4,
Each of the doctor blades 4, 4, the seal plates 5, 5 on both sides, and the recess 3
A liquid storage space S surrounded by a is formed. The doctor blades 4, 4 are arranged so that the blade free end side interval W2 is smaller than the blade fixed side interval W1.
Each of the seal plates 5 is disposed so as to intersect at right angles with the two doctor blades 4 and 4 so that both side surfaces 5a and 5a are in contact with each other (see FIG. 7).

[0003] The coating liquid supply device 1 contacts the outer peripheral surface of the gravure roll 2 rotating in the direction of the arrow B with the coating liquid supplied from the supply port 3b of the base 3 to the liquid storage space S. Excess coating liquid adhering to the outer peripheral surface of the gravure roll 2 is scraped off with a doctor blade 4
a, 2a... The rotating gravure roll 2 transfers the coating solution of the cells 2a, 2a,.

[0004]

By the way, as shown in the enlarged view of FIG.
The base 3 is pressed in the direction of arrow C in order to reliably scrape off the excess coating liquid adhering to the outer peripheral surface of the gravure roll 2 and the scraping tip 4a of the doctor blade 4 is pressed against the outer peripheral surface of the gravure roll 2. To use.

However, each doctor blade 4 is elastically deformed and bent as shown by a two-dot chain line in FIG.
A large gap G is formed between the seal plate 5 and the side surface 5a crossing at right angles, and a large amount of the coating liquid leaks from the gap G. Since a large amount of the coating liquid leaks, the coating liquid supply device 1 is contaminated, which hinders smooth coating and causes defects in the coated product, and also deteriorates the working environment.

Accordingly, an object of the present invention is to provide a coating liquid supply device capable of suppressing the leakage of the coating liquid in order to solve the above problems.

[0007]

The gist of the present invention is that two elastic doctor blades, which are attached to a base in a cantilever manner so as to face each other, have a blade free end closer to a blade fixed side interval. It is arranged so that the interval is narrower, and each of the two doctor blades near each end,
A coating liquid supply device in which elastic sealing plates attached to the base in a cantilevered state are arranged so as to be in contact with two doctor blades and form a liquid storage space surrounded by the doctor blade, the sealing plate and the base. , Wherein each seal plate is arranged obliquely so that a contact line between two doctor blades and each seal plate extends in a direction obliquely crossing each doctor blade.

According to the first aspect of the present invention, by arranging the seal plate at an angle, the bending direction of the distal ends of the two doctor blades becomes the pressing direction for bending the cantilevered seal plate. Therefore, when the base is pressed and the scraping tip of the doctor blade is pressed against the outer peripheral surface of the gravure roll, the doctor blade elastically deforms and bends. Is pressed to bend and deform the seal plate, and a large gap is not generated between the doctor blade and the both side edges of the seal plate that are bent and deformed together.

According to a second aspect of the present invention, a cantilevered outer seal plate is disposed outside each of the seal plates at an appropriate distance from each of the seal plates. The coating liquid supply device according to claim 1, wherein a leakage liquid discharge port communicating with a space between the seal plate and the seal plate is provided. The outer sealing plate may be arranged so as to contact two doctor blades.

According to the second aspect of the present invention, even if the coating liquid leaks from a minute gap formed between the doctor blade and both side edges of the seal plate, the leaked coating liquid is removed. Since the liquid is discharged from the leak liquid discharge port to the outside, the outside of the coating liquid supply device is not contaminated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A coating liquid supply apparatus according to the present invention will be described below with reference to the embodiments shown in FIGS. FIG. 1 is a partially sectional side view of a coating liquid supply device, and FIG.
FIG. 3 is an enlarged cross-sectional view taken along the line II in FIG. 1 and partially omitted in the middle. FIG. 3 is a cross-sectional view showing a part cut along the roro line in FIG. 1. FIG. 4 is a gravure roll, two doctor blades and one seal. FIG. 5 is a side view showing the doctor blade and one seal plate in a pressure-contact state in an enlarged manner.

The construction of the coating liquid supply device 11 other than the later-described improvements is substantially the same as that of the conventional device. That is, as shown in FIGS. 1 to 3, the coating liquid supply device 11 is arranged outside the gravure roll 2, and moves in the direction of arrow A toward the gravure roll 2. The coating liquid supply device 11 includes a base 13 extending in the longitudinal direction of the gravure roll 2, two elastic doctor blades 14, 14 attached to the base 13 in a cantilever state so as to face each other, and two Elastic seal plates 15 attached to the base 13 in a cantilevered state are provided at both ends between the doctor blades 14, 14, respectively, and these doctor blades 14, the seal plates 15, 15 on both sides and the base 13 are provided. A liquid storage space S surrounded by the concave portion 13a is formed. The doctor blades 14, 14 are arranged such that the blade free end side interval W2 is smaller than the blade fixed side interval W1.

The first improvement of the coating liquid supply device 11 is that, as shown in FIG. 4, both contact lines K, K between the two doctor blades 14, Seal plate 1 so as to follow the direction obliquely crossing
5 and 15 are arranged in an inclined manner (see FIG. 2). Second
As shown in FIG. 2, as shown in FIG. 2, a cantilevered outer seal plate 16 is arranged outside each seal plate 15 with an appropriate interval M between the seal plates 15. That is, the leaked liquid discharge port R communicating with the space N between the outer seal plate 16 and the outer seal plate 16 is opened. Each seal plate 15 and outer seal plate 16
The doctor blade 1 is used to facilitate bending deformation.
It is molded from a synthetic resin plate such as a polyethylene plate or a Teflon plate having an appropriate thickness and a smaller bending rigidity than 4.

Each of the seal plate 15 and the outer seal plate 16 may be inclined (not shown) so as to be displaced outside the liquid storage space S as it goes toward the tips 15b, 16b. It is preferable to make the inclined state displaced inside the space S. This is because the coating liquid is sufficiently supplied to the tip 15b of each seal plate 15 so that the outer surface of the gravure roll 2 does not run out. The tip 15b of each seal plate 15 is made as close as possible to the outer surface of the gravure roll 2, so that the leakage of the coating liquid from the liquid storage space S is minimized.

As shown in FIG. 1, in order to adjust the bending rigidity of each doctor blade 14, an elastic and thick back-up plate 17 may be brought into contact with a base portion. Each doctor blade 14 and the back-up plate 17 are sandwiched between the base 13 and the fixture 18 and are replaceable. Further, as shown in FIG. 2, each of the sealing plates 15 may abut an elastic back-up plate 19 having a large bending stiffness as necessary in order to adjust the bending stiffness. At this time, each seal plate 15 has a portion where the back-up plate 19 does not come into contact with the front end and both inclined side edges. Each of the seal plate 15 and the back-up plate 19 is sandwiched between the base 13 and the detent 20 and is replaceable. The outer seal plate 16
It is sandwiched between the detent 20 and the fixture 21 and is replaceable.

According to the first improvement, as shown in FIG.
When viewed on an imaginary plane P perpendicular to the doctor blade 14 (θ2 = 90 °), each seal plate 15 has an intersection angle θ1 with the doctor blade 14 on the liquid storage space S side.
Is an obtuse angle (for example, θ1 = 125 °). The doctor blades 14 press the base 13 in the direction of arrow C as shown in FIG. 5 and the bent and deformed scraping tip 14a is displaced in the direction of arrow E as shown by the two-dot chain line in the figure. Along with,
The cantilevered sealing plate 15 is pressed to bend the tip 15b in the direction of arrow F shown in FIG. Therefore, when the scraping tips 14a, 14a of the doctor blades 14, 14 are pressed against the outer peripheral surface of the gravure roll 2, the doctor blades 14, 14 are elastically deformed and bent.
Pressing both side edges 15c, 15c of each cantilevered sealing plate 15 causes the sealing plate 15 to bend and deform, and a large distance is formed between the doctor blades 14, 14 that both bend and deform and both side edges 15c, 15c of the sealing plate 15. No gaps are created.

As a result, a large amount of the coating liquid does not leak from the boundary between the doctor blades 14, 14 and each seal plate 15. In addition, even if the seal plate 15 is bent and deformed, the dimension at which the tip 15b separates from the outer peripheral surface of the gravure roll 2 is very small. Therefore, the tip 1 of each seal plate 15
A large amount of the coating liquid does not leak from the boundary between 5b and the outer peripheral surface of the gravure roll 2. Even if a small amount of the coating liquid leaks, the leaking coating liquid is discharged to the leaking liquid outlet R.
(See FIG. 2), the coating liquid is supplied to the outside,
Will not contaminate.

As shown in FIG. 3, the outer seal plate 16 has its tip 16b as close to the outer surface of the gravure roll 2 as possible, as shown in FIG.
It is preferable that the 6c and 16c bend and deform by contacting the two doctor blades 14 and 14. This is because the space N between the seal plate 15 and the outer seal plate 16 (see FIG. 2)
The coating liquid leaked to the two doctor blades 14, 14
This is to prevent leakage from the boundary between the outer seal plate 16 and the outer seal plate 16.

As shown in FIG. 1, the coating liquid supply device 11 according to the above-described configuration includes a gravure roll 2 rotating in the direction of arrow B.
The coating liquid supplied to the liquid storage space S from the supply port 13b of the base 13 is brought into contact with the outer peripheral surface of the gravure roll 2.
Excess coating liquid adhering to the outer peripheral surface of the doctor blade 1
4 to scrape the coating liquid into the cells 2a of the gravure roll 2. The rotating gravure roll 2 transfers the coating liquid of the cells 2a, 2a,... To a running web held by a backing roll (not shown).

[0020]

As described above in detail, the coating liquid supply apparatus according to the present invention has the following excellent effects.

According to the first aspect of the present invention, since there is no large gap between the doctor blade elastically deformed by pressing and the both side edges of the seal plate elastically deformed, a large amount of leakage of the coating liquid is suppressed. As a result, the quality of the coated product can be maintained and the working environment can be maintained by maintaining a smooth coating state.

According to the second aspect of the present invention, since the leaked coating liquid is forcibly discharged to the outside from the leaked liquid discharge port, and the outside of the coating liquid supply device is not contaminated, the quality of the coated product can be further maintained. The work environment can be maintained at the same time.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a coating liquid supply device according to the present invention, and is a partially sectional side view of the entire coating liquid supply device.

FIG. 2 is an enlarged sectional view taken along the line II of FIG. 1 and omitting an intermediate portion.

FIG. 3 is a cross-sectional view showing a part taken along a roll line of FIG. 1;

FIG. 4 is a perspective view showing a roll, two doctor blades, and one seal plate.

FIG. 5 is an enlarged side view showing a doctor blade and one seal plate in a pressed state.

FIG. 6 is a partially sectional side view showing a conventional coating liquid supply device.

FIG. 7 is a plan sectional view showing one seal plate of the conventional coating liquid supply device.

FIG. 8 is an enlarged side view showing a doctor blade and one seal plate in a pressure contact state in a conventional coating liquid supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 ... Base 14 ... Doctor blade 15 ... Seal plate 16 ... Outer seal plate K ... Contact line R ... Leakage liquid discharge port

Claims (2)

[Claims] An elastic doctor blade, which is attached to a base portion in a cantilever manner so as to face each other, is disposed so that a blade free end side interval is narrower than a blade fixed side interval. Each of the elastic seal plates attached in a cantilevered state to the base portion are arranged so as to be in contact with the two doctor blades, respectively, near each end between the blades,
In a coating liquid supply device having a liquid storage space surrounded by the doctor blade, the seal plate, and the base, a contact line between the two doctor blades and each seal plate extends along a direction obliquely crossing each doctor blade. As described above, the coating liquid supply device is characterized in that the respective seal plates are arranged obliquely. 2. An outer seal plate in a cantilever state is disposed outside each of the seal plates at an appropriate interval between the seal plates and communicates with a space between each seal plate and the outer seal plate. The coating liquid supply device according to claim 1, wherein a leakage liquid discharge port is opened.